2000 server network problem

I am running win 2K with a single domain and single DC. I have 2 laptops, a
desktop, and the server on the network. I have a netgear wireless router
connected to roadrunner for isp. The laptops and the server have wireless
adapters. The desktop is wired directly to the router. I am having trouble
file and printer sharing. Sometimes all the hosts will appear in Win
Explorer but most times they do not. Sometimes I can drill down and connect
to a printer (printers on each laptop and the desktop - all set to share),
and sometimes not. Sometimes the host name appears in the explorer but when
you click on it, it says "network path cannot be found".

I have re-installed DNS, DHCP & rebuilt the active directory, but still no
luck.

Any ideas?